Liebert PEX - Compressor Models User Manual - AP11ENT-PEXCompModelsV1-UM

8/18/2019 Liebert PEX - Compressor Models User Manual - AP11ENT-PEXCompModelsV1-UM

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Next Generation Critical Coolingfor Room and Row

Liebert PEXEfciency And Reliability For High Availability Cooling

Compressor ModelsUser Manual


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Liebert PEX Series Air Conditioner

User Manual

Version V1.4

Revision date July 27, 2010

BOM 31011774

Emerson Network Power provides customers with technical support. Users may contact the

nearest Emerson local sales office or service center.

Copyright © 2010 by Emerson Network Power Co., Ltd.

All rights reserved. The contents in this document are subject to change without notice.

Emerson Network Power Co., Ltd.

Address: No.1 Kefa Rd., Science & Industry Park, Nanshan District 518057, Shenzhen China

Homepage: www.emersonnetworkpower.com.cn

E-mail: [email protected]


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Contents

Chapter 1 Overview........................................................................................................................................................... 1

1.1 Model Description............................................................................................................................................... 1

1.2 Product Introduction ........................................................ ............................................................ ...................... 2

1.3 Product Appearance........................................................................................................................................... 3

1.4 Main Components............................................................................................................................................... 3

1.4.1 Indoor Unit ............................................................ ............................................................ ....................... 4

1.4.2 Outdoor Unit .......................................................... ............................................................ ...................... 4

1.4.3 iCOM Controller ........................................................... ............................................................... ............. 5

1.4.4 Remote Monitoring Software.................................................................................................................. 5

1.5 Environmental Requirements .................................................... ........................................................... ............. 5

1.5.1 Operating Environment........................................................................................................................... 51.5.2 Storage Environment ...................................................... ........................................................... ............. 5

Chapter 2 Mechanical Installation ........................................................... ........................................................... ............. 6

2.1 Movement, Unpacking And Inspection................ ........................................................... .................................. 6

2.1.1 Transportation And Movement............................................................................................................... 6

2.1.2 Unpacking ........................................................ ........................................................ ................................ 6

2.1.3 Inspection................................................................................................................................................. 8

2.2 Installation Notes................................................................................................................................................ 8

2.3 System Installation Arrangement...................................................................................................................... 8

2.3.1 Overall System Arrangement .......................................................... .................................................... ... 8

2.3.2 System Installation Illustration........................................................... .................................................. 11

2.3.3 Mechanical Parameters.......................................... .......................................................... ..................... 12

2.4 Installing Indoor Unit ...................................................... ............................................................. ..................... 20

2.4.1 Equipment Room Requirement......................................................... ................................................... 20

2.4.2 Installation Space ........................................................ ..................................................... ..................... 20

2.4.3 Requirement Of Maintenance Space ....................................................... ............................................ 21

2.4.4 Installation Procedures............................................................. ........................................................ .... 22

2.5 Installing Outdoor Unit ..................................................... ........................................................... ..................... 25

2.6 Piping................................................................................................................................................................. 25

2.6.1 Piping For Air-Cooled Unit.................................................... ............................................................ .... 25

2.6.2 Piping For Water-Cooled Unit................................................... ........................................................... . 292.7 Lowering Fan And Removing Fixtures (Downflow EC Fan System) ....................................................... ..... 30

2.7.1 Downflow Unit EC Fan Lowering............................................................................... ........................... 30

2.7.2 Removing Transport Fastener And Vibration Absorber ..................................................... ............... 33

2.8 Installation Inspection...................................................... .......................................................... ...................... 36

Chapter 3 Electrical Installation................... ....................................................... ........................................................... 37

3.1 Work Introduction And Installation Notes ............................................................... ....................................... 37

3.2 Wiring Of Indoor Unit............................................. ............................................................ ............................... 37

3.2.1 Locating Electrical Interface Of Indoor Unit.................. ........................................................... ........... 37

3.2.2 Connecting Power Cable Of Indoor Unit ............................................................. ................................ 38

3.2.3 Connecting Control Cables ...................................................... ......................................................... ... 39


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3.2.4 Connecting Solenoid Valve Of Pipe Extension Kit (Options, For Site Installation) ......................... 40

3.3 Wiring Of Outdoor Unit (For Air-Cooled Series)....................................................................... ...................... 40

3.3.1 Connecting Control Signal Cables Of Outdoor Unit......................................... .................................. 40

3.3.2 Connecting Power Cables Of Outdoor Unit ........................................................ ................................ 413.4 Installation Inspection...................................................... .......................................................... ...................... 41

Chapter 4 System Power-On Commissioning ............................................................ .................................................. 42

4.1 Location Of MCBs....................... ............................................................ ......................................................... . 42

4.2 Power-On Commissioning Of Air-Cooled Series ..................................................... ...................................... 43

4.2.1 Preparation Before Commissioning ....................................................... ............................................. 43

4.2.2 Commissioning Procedures..................................................... .......................................................... .. 44

4.2.3 Inspection After Commissioning ................................................... ...................................................... 45

4.3 Power-On Commissioning Of Water-Cooled Series ...................................................... ................................ 46

4.3.1 Preparation Before Commissioning ....................................................... ............................................. 46

4.3.2 Commissioning Procedures..................................................... ........................................................... . 474.3.3 Inspection After Commissioning ........................................................ ................................................. 48

Chapter 5 iCOM Controller ....................................................... ................................................................ ...................... 49

5.1 LCD ................................................... ....................................................... .......................................................... 49

5.2 Button And Indicator Panel.................................... ........................................................... ............................... 49

5.3 Structure Chart Of Control Menu......................................................... ......................................................... ... 51

5.4 Startup Interface ..................................................... .................................................................... ...................... 51

5.5 Main Interface.......................................................... ........................................................... ............................... 51

5.6 USER MENUS................................................................ .............................................................. ...................... 52

5.6.1 PASSWORD ....................................................... ........................................................ ............................ 52

5.6.2 SETPOINTS.................................................... ........................................................ ................................ 52

5.6.3 EVENT LOG.............................. ............................................................ .................................................. 52

5.6.4 GRAPHICS......................................... ........................................................... .......................................... 54

5.6.5 SET ALARMS.................................................... ........................................................... .......................... 54

5.6.6 SENSOR DATA ...................................................... ........................................................... ..................... 55

5.6.7 DISPLAY SETUP............................................................ ........................................................... ............. 56

5.6.8 TOTAL RUN HRS ............................................................ ........................................................... ............ 57

5.6.9 SLEEP MODE......................................................... ........................................................... ..................... 58

5.6.10 SERVICE INFO .......................................................... ............................................................... ............ 58

5.6.11 ACTIVE ALARMS....... ....................................................... ............................................................... .... 58

5.7 SERVICE MENUS....................................................... ................................................................. ...................... 585.7.1 PASSWORD LEVEL........................................................ ............................................................ ........... 59

5.7.2 SETPOINTS......................................................... .............................................................. ..................... 59

5.7.3 STANDBY.............................................................. ........................................................... ...................... 60

5.7.4 WELLNESS........................................................................... ............................................................... ... 60

5.7.5 DIAGNOSTICS............................................ ................................................................ ............................ 63

5.7.6 SET ALARMS................................................ ....................................................... .................................. 65

5.7.7 CALIBRATION....... ........................................................... ........................................................... ........... 67

5.7.8 NETWORK SETUP ............................................................ ......................................................... ............ 67

5.7.9 OPTIONS SETUP ............................................................ .......................................................... ............. 68

5.7.10 SERVICE INFO ..................................................... ........................................................... .....................69

5.8 ADVANCED MENUS........................................................ ............................................................. ..................... 69


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5.8.1 PASSWORD LEVEL......................................................... ........................................................... ........... 69

5.8.2 FACTORY SETUP ............................................................ .......................................................... ............ 70

5.9 MBV Settings........................................ ........................................................... .................................................. 74

5.10 EVENT NAME AND DEFINITION ............................................................... ..................................................... 75

Chapter 6 Application Of INTELLISLOT............................................................ .......................................................... .. 79

6.1 Introduction Of Host Communication Cards................................................................... ............................... 79

6.2 Installation Of Host Communication Cards............................................................ ........................................ 79

6.3 Commission Of Host Communication Component......................................................... ............................... 80

6.3.1 Setting HyperTerminal ..................................................... ......................................................... ............ 80

6.3.2 Setting 485 Communication Card ...................................................... .................................................. 82

6.3.3 Setting TCP/IP Communication Card............................. ........................................................... ........... 83

6.3.4 Setting SNMP Parameters Of TCP/IP Communication Card........................................................ ...... 85

6.4 Host Communication Networking Diagram.............................................................. ...................................... 88

Chapter 7 System Operation And Maintenance ......................................................... .................................................. 89

7.1 System Diagnosing Test .......................................................... .................................................... .................... 89

7.1.1 Self-diagnosis Function...................................................... ...................................................... ............ 89

7.1.2 Electric Control Part................................................................. .......................................................... ... 89

7.2 Filter ..................................................... ........................................................... ................................................... 91

7.3 Fan Components............................................................................. ....................................................... ........... 91

7.3.1 FC Fan ................................................... ........................................................... ...................................... 91

7.3.2 EC Fan .......................................................... ............................................................ .............................. 91

7.4 Infrared Humidifier.................................... ........................................................... ............................................. 91

7.5 Electric Heater..................................... ........................................................... ................................................... 93

7.6 Cooling System........................... ........................................................... .......................................................... . 94

7.6.1 Suction Pressure................................................... ........................................................... ..................... 94

7.6.2 Discharge Pressure...... ........................................................... .......................................................... .... 94

7.6.3 Suction Superheat Degree.......................... ........................................................... ............................... 95

7.6.4 Thermal Expansion Valve ......................................................... ........................................................... . 95

7.6.5 Hot Gas Bypass Valve (For Single Compressor System) ............................................................ ...... 95

7.6.6 Air-Cooled Condenser........................................................................................ ................................... 96

7.6.7 Water-Cooled Condenser.............................................................................. ........................................ 96

7.6.8 Compressor ................................................... ........................................................... ............................. 96

Chapter 8 Troubleshooting ............................................................ .......................................................... ...................... 98

Appendix 1 Composition Of Electrical Control Box.................................................................. ................................. 105

Appendix 2 Circuit Diagram ................................................... ................................................................. ..................... 107

Appendix 3 Menu Structure Of iCOM Controller ........................................................... ............................................. 108


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2 Chapter 1 Overview

Liebert PEX Series Air Conditioner User Manual

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

P 2 0 5 0 D A S 3 J H L 1 2 4 1 0 0 0 0 P 0 0 0 0

Digit1 Model Range Digit16 Enclosure options

P P EX 1 S tandard C olor Charcoal grey

Digit2 Modules 2 C olo ur S pe cia l c olo r

2 Num ber of Modules/B ays 6 C olor C harcoal grey w /Double skin

Digit3 Cooling Capacity kW Digit17 Mains Switch High Voltage Option

Nom inal G ross Cooling C apacity - kW 0 N oneDigit4 Cooling Capacity kW D M a in n on -L oc ki ng D is co nn ec t

Nominal Gross Cooling Capacity - kW Digit18 Lock Out Low Voltage Option

Digit5 Cooling Capacity kW 0 N one

Nom inal G ross C ooling C apacity - kW H R eheat & Hum idity Lockout

Digit6 Air Discharge Digit19 Monitoring

U Upflow 0 M onitoring - N o C ard

D Dow nflow 1 M onitoring - IS W E B only

Digit7 System Type 2 M on ito rin g - T wo IS W EB

A Ai r c oo le d 3 Mo ni to rin g - I S4 85 on ly

W W ate r co ole d 4 M on ito rin g - T wo IS 48 5

G G lycol Cooled 5 M onitoring - IS W EB & IS485

D D ua l C o ol - c hi lle d w at er + a ir c oo le d 6 M o ni to ri ng - i CO M D O

H D u a l C o o l - c h il le d w a te r + w a te r c o ol ed D M o n it or in g - I SW E B & i C OM D O

F Free cool E Monitoring - Two ISW EB & iC OM D O

C C hilled W ater F Monitoring - IS485 & iCO M DO

R C h il le d W a te r - D u al S o ur ce G M on it or in g T w o I S4 85 & iC O M D O

Digit8 Airflow H M on it or in g - I SW E B & IS 4 85 & iC O M DO

1 E C Plu g fa n - St an da rd St at ic Digit20 Sensors

S Forward C urved fan - S tandard Static 0 None

Digit9 Power Supply S Sm oke Senso r

3 400V / 3ph / 50H z+N H High Temperature

T 3 80 V / 3 ph / 6 0H z N H ot a nd C old Is le S en so r A & S en so r B ( In addition to Standard Sensor)

A 46 0V / 3 ph / 6 0H z F Sm ok e & Hi gh Te mp

Digit10 Cooling System Digit21 Packaging

C C om pliant S cro ll S ingle C ircu it R 407C P P ackaging - S tandard

S Com pliant S cro ll D ual C ircu it R 407C C P ackag ing - W ooden crate Export

E D ig it al S c ro ll S in g le C i rc u it R 4 07 C Digit22 Special Requirements

D Digita l Scro ll D ual C ircu it R407C A S FA - none

J C om pliant Scro ll S ingle C ircu it R 22 Z For Internal U se Only(For Austra lia and N ew zealand)

F Com pliant S cro ll D ual C ircu it R22 T For Internal U se On ly(C hina Telecom )

2 CW Tw o way Valves S tandard P ressure C For Internal U se O nly(C hat U nion)

3 C W T hr e e w a y V a lv es St an d ar d P r es su re Digit23 Order Identifier

Digit11 Humidification 0 N one

0 None 1 H igh ES P 100 P a

H Infrared H um idifier 2 H igh ES P 200 P a

S Electrode hum idifier 3 H igh A irflow/E SP other

Digit12 Display X S FA Included

S S ma ll Dis pla y 1 TH S en so r Digit24 Order Identifier

L Large D isplay 1 TH sensor 0 N one

Digit13 Re-Heating L A ir Co o le d -L o n g P ip e Ru n Ki t> 3 0 m e te rs

0 None X S FA Included

1 E le ct ri c h ea ti ng S td 1 S ta ge Digit25 Order Identifier

2 E lectric heating O pt. 2 Stage U p 0 N one

Digit14 Filtration X S FA Included

2 G 4 ( EU 4 ) gr av im e tr ic ( re f M ER V 8 ) + C lo g g ed F i lt er

3 F 5 ( E U5 ) d u st s po t + Cl og g ed F il te r

Digit15 Coil and Valves

S Standard DX Ai r Coo led Co i l

4 Coi l DX - Al l va lves High Pressure MBV,DX - 2 way, CW co i l 2 way

K Coi l DX - Al l va lves High Pressure MBV,DX - 3 way, CW co i l 3 way

N Coi l DX - Al l va lves High Pressure MBV,DX - 2 way, CW co i l 3 way

P Coi l DX - Al l va lves High Pressure MBV, DX - 3 way,CW co i l 2 way

0- 9

0- 9

0- 9

Figure 1-1 Model description

1.2 Product Introduction

The Liebert PEX series air conditioner is a medium-large sized precision environment control system, which

is suitable for the environment control of the equipment room or computer room. It aims to provide a sound

operating environment for precision equipment, such as sensitive equipment, industry processing equipment,

communication equipment and computers.

The Liebert PEX series air conditioner features high reliability, high sensible heat ratio and large airflow. It is

configured with an infrared humidifier adjustable to different water qualities, and is compatible with R407C

green refrigerant to meet the international requirement.


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Chapter 1 Overview 3


The unit is classified into dual cooling system, single source cooling system and free cool system in the light

of the function module. All kinds of different function systems can use the forward centrifugal curved fan (FC

fan for short) and the speed adjustable DC electronically commutated fan (EC fan for short).

Dual cooling system

The unit contains the compressor refrigerating system and the chilled-water system. The control board can

select whether to run under the compressor refrigerating system or the chilled-water system flexibly

according to the connected chilled-water condition and the indoor load, so as to achieve the energy-saving

operation of the unit.

Single source cooling system

The unit contains the compressor refrigerating system only.

Free cool system

The unit contains the compressor refrigerating system and the free cool system. Free cool system can be

connected with the special dry cooler. Under the conditions of the low outdoor temperature, the unit can

select whether to run under the compressor refrigerating system or the free cool system flexibly according to

the free cool medium condition provided by dry cooler and the indoor load, so as to achieve the

energy-saving operation of the unit. According to the cooling mode of the refrigerant side, the unit contains

the air-cooled series and the water-cooled series.

Air-cooled series

The Liebert PEX air-cooled series air conditioner comprises indoor unit and outdoor unit. With the standard

configuration of Liebert PEX condenser unit, it can reduce noise pollution to the minimum while meeting

system cooling requirement through the pressure regulating the fan speed. The Liebert PEX low temperature

CS (D) F_S series outdoor unit can also be configured for it, qualifying the system to normally operate in

cooling mode at the temperature down to -84.2°F. Please consult Emerson Network Power Co., Ltd. (Emerson

for short) if the lower temperature is required.

Water-cooled series

The Liebert PEX water-cooled series air conditioner uses integrated structure and highly effective

brazed-plate heat exchanger (BPHE), thus it is compact, efficient and quiet.

1.3 Product Appearance

Taking the two-bay unit of FC fan for example, the appearance of the Liebert PEX series air conditioner is

shown in Figure 1-2.

Downf lowUpf low

Figure 1-2 Appearance (two-bay unit)

1.4 Main Components

The main components of Liebert PEX air conditioner include indoor unit, outdoor unit and iCOM controller.


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4 Chapter 1 Overview


1.4.1 Indoor Unit

The indoor unit of the Liebert PEX air conditioner includes compressor, evaporator, thermal expansion valve,

infrared humidifier, fan, electric heater, sight glass and filter drier. Besides these components, the

water-cooled series indoor unit also includes BPHE and electric valve.

Compressor

The highly effective Copeland scroll compressor is used, featuring low vibration, low noise and high reliability.

The Rotalock connection mode makes the maintenance easier.

Evaporator

The finned tube evaporator with high heat dissipation efficiency is used. The distributor is designed and

validated according to specific model to ensure that the refrigerant is distributed evenly in each loop,

improving the evaporator efficiency to a great extent.

Thermal expansion valve

The external equalizer type thermal expansion valve is used. It can collect temperature and pressure signals

at the same time, so that it can regulate the refrigerant flow more accurately.

Infrared humidifier

The infrared humidifier is designed with a simple structure, which is easy for teardown, cleaning and

maintenance. Application of the infrared humidifier can reduce the dependence on water quality. It also

features fast startup, short humidifying time, large humidifying capacity and high humidifying efficiency.

Fan

The forward centrifugal fan with high efficiency and high reliability can be used. It features large airflow, long

blowing distance, belt transmission and convenient maintenance. Users can also select the EC fan, which

features high efficiency, energy-saving, space-saving and low noise. EC fan unit uses elaborate structure

design, and the downflow unit uses the ‘in-floor’ design, which positions the fan unit below the floor to further

improve the efficiency of air supply.

Electric heater

The spiral fin U-type stainless steel heater is used. It features fast heating speed and even heat.

Sight glass

The sight glass is the window of the system cycle, for observing the refrigerant state, mainly the moisture

content of the system. When the moisture content exceeds the standard, the color will be changed.

Filter drier

The filter drier eliminates the moisture effectively in the system, and also filtrates the impurities generated

during the long-term system operation so as to ensure normal system operation.

BPHE (for water-cooled series)

The brazed plate auto-cleansing BPHE is used. It features compact structure and high heat exchanging

efficiency. Rotalock connections are provided for water and refrigerant sides.

Electric valve (for water-cooled series and chilled water system)

Water-cooled series: The precise electric valve is used. The water flow in the BPHE can be regulated through

the intelligent valve position control of the control board, so as to ensure stable system operation.

Chilled water system: The electric valve provides proportional regulation of chilled water flow according to

the cooling requirement.

Union mode is used to connect the electric valve to the system pipeline, which is convenient for installation at

site and maintenance, reducing the project installation expenses.

1.4.2 Outdoor Unit

The outdoor unit is applicable to the Liebert PEX air-cooled series air conditioner. For details, refer to LiebertPEX Condenser User Manual .


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Chapter 1 Overview 5


1.4.3 iCOM Controller

The iCOM controller of the Liebert PEX series air conditioner uses the LCD screen with blue backlight and 128

× 64 pixels, or selects the large screen with 320 × 240 pixels. The user interface operation is simple. The

multi-level password protection can effectively prevent unauthorized operation. It also provides power failure

auto-restoration and high & low voltage protection functions. The operation time of components is available

through the menus. The expert-level fault diagnosis system can automatically display the current faultinformation, facilitating the maintenance. It can store up to 400 historical event records. There are two kinds

of panels for option: one with common screen and the other with large screen, as shown in Figure 1-3.

Common screen Large screen

Figure 1-3 Panel of iCOM controller

1.4.4 Remote Monitoring Software

Through the configured RS485 port or TCP/IP port, the Liebert PEX air conditioner can communicate with the

host computer and receive the control of the host software.

1.5 Environmental Requirements

1.5.1 Operating Environment

See Table 1-1 for operating environment requirement.

Table 1-1 Operating environment requirement

Item Requirement

Ambient temperatureIndoor 0°C ~ 40°C

Outdoor Water-cooled series: 4°C ~ 45°C; Air-cooled series:-48°C~ +45°C

Protection level (outdoor unit) IP55

Altitude


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6 Chapter 2 Mechanical Installation


Chapter 2 Mechanical Installation

This chapter introduces the mechanical installation of the Liebert PEX series air conditioner, including the

transportation, movement, unpacking, inspection, installation notes, system installation arrangement,

installing indoor unit, installing outdoor unit, piping for unit, lowering fan, removing fixtures and installation

inspection.

2.1 Movement, Unpacking And Inspection

2.1.1 Transportation And Movement

Railroad transportation and shipping are the recommended means of transportation. If truck transportation is

unavoidable, choose roads that are less bumpy in order to protect the equipment.

The Liebert PEX series air conditioner is heavy (see Table 2-1 for the weight). It is recommended to use

mechanical equipment such as an electric forklift to unload and move the equipment to the place closest to

the installation site. If an electric forklift is used, insert the tines of the forklift below the pallet, as shown in

Figure 2-1. Align the tines with the center of gravity to prevent the equipment from falling over.

Figure 2-1 Inserting and movement

When moving the indoor unit, keep the obliquity within the range from 75° to 105°, as shown in Figure 2-2.

1 0 5 7 5

Figure 2-2 Moving obliquity of indoor unit

2.1.2 Unpacking

Move the equipment to the place closest to the final installation site and then unpack it.

Follow the procedures below for unpacking:


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Chapter 2 Mechanical Installation 7


1. Remove the side panels and top cover

Liebert PEX series air conditioner uses the international packaging. You can use a hammer or straight

screwdriver to straighten the connection hook that connects the side panels to the top cover, as shown in

Figure 2-3.

Figure 2-3 Straightening the hook

At first, straighten all the hooks that fix side panel I, and remove side panel I. Then straighten all the hooks

that fix side panel II, and remove side panel II. At last remove top cover III, as shown in Figure 2-4.

Kg

1790 x 950 x 2020mm

1816 x 976 x 2175mm

I

I

III

II

II

Figure 2-4 Removing side panels and top cover

2. Remove the base pallet.

The unit is fixed onto the base pallet with M8 × 65 fixing bolts, as shown in Figure 2-5. You can use a 17mm

open-end spanner, ratchet spanner or sleeve to remove the fixing bolts.

Fixing bolt on base pallet M8 6 5

Figure 2-5 Fixing bolt on the base pallet


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2.1.3 Inspection

After receiving the product, you should unpack it, and then check against the packing list that the fittings are

complete and that the components are intact. If any parts are found missing, or damaged, please report to the

carrier immediately. If any defects are found, please report to the local offices of the carrier and the distributor.

2.2 Installation Notes

To achieve the designed performance and maximize the product life, the correct installation is vital. This

section should be applied in conjunction with the prevailing industry standards of mechanical and electrical

installation.

1. The Liebert PEX air-cooled series air conditioner is designed for split floor installation. The indoor unit

must be installed on the floor of the equipment room or computer room, and the outdoor unit can be installed

outdoors or on the floor of other rooms. The Liebert PEX water-cooled series air conditioner is designed for

integrated floor installation. It should be installed on the floor of the equipment room or computer room.

2. Before installation, make sure that the installation environment meets the requirements (see 1.5

Environmental Requirements) and confirm whether the building needs to be transformed to accommodate the

construction work of piping, wiring layout and ventilation ducts.3. Follow the design drawings strictly when installing the equipment, and reserve the space for routine

maintenance and servicing. The manufacturer’s engineering dimension drawings can serve as a reference.

2.3 System Installation Arrangement

2.3.1 Overall System Arrangement

The Liebert PEX series air conditioner includes air-cooled series and water-cooled series, and their overall

system arrangements are shown in Figure 2-6 and Figure 2-7 respectively.


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Chil led

water coi lEvaporator

EC/FC fan

Expansion valve

Sight glass

Filter

drier

C om pressor C om pressor

Refr igerant

Ai r- co ol ed co nd en se r

FA N

Water-cooled or

glycol-cooled

Low pressure

H P

sensor

iCOM control

FA N

iCOMcontrol

B P H E

iCOMcontrol

Balancing valve o r isolat ion valve*

Filter*

Drain valve*

Isolat ion valve*

Hose port*

Cool ing water o r glycol l iquid

W elding port of chi l led water in/out port

3-wayball valve

Liquiddistributor

Chilled



Hose port*

Isolat ion valve*

sensor

High pressuresensor

Refr igerantH P

sensor

Sight glass

Liquid

distributor

EC/FC fan

Low pressuresensor

High pressure

sensor Refr igerant Ai r- co ol ed co nd en se r

Ai r-c oo le d ou td oo r Ai r-c oo le d ou td oo r

B P H E

Refr igerant

3-way bal l

va lve3-way bal l

va lve

condenser water or glycol l iquid

Water-cooled or

glycol-cooled

Filter

dr ier

condenser water or glycol l iquid

Figure 2-6 Dual system diagram of unit

Note

MUST ENSURE THAT MECHANICAL FILTER/STRAINER IS FITTED TO INLET OF BPHE CIRCUITS BY INSTALLER!


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Compressor

H Psensor

iCOM control

FA N

B P H E

Balancing valve o r isolat ion valve*

Filter*

Isolat ion valve*

Drain valve*

Hose port*


3-way bal l

valve

Chilled

water coi l

Low pressure sensor

High pressure sensor

Evaporator

Chilled


Liquiddistributor

EC/FC fan

Liquiddistributor

EC/FC fan

Expansion valve

Hot gas

bypass valve

Sight glass

Filter drier

Refr igerant

Refr igerant

Ai r-c oo le d co nd en se r

Ai r-c oo le d ou td oo r

3-way bal l

va lve

iCOM cont ro l

Condenser water

or glycol l iquid

Water-cooled or

glycol-cooled

Isolat ion valve*

Hose port*


Figure 2-7 Single system diagram of unit


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Note

1. The contents in the dotted line boxes are the water-cooled unit and air-cooled unit condenser schematic diagram that divided

by the cooling mode of the refrigerant system. Select the corresponding pipe connection according to the actual type in use, thedashed lines are for pipe connection at site, * components can be selected according to the actual requirements.

2. High pressure sensor is used for water-cooled or glycol-cooled unit only.

3. Single source cooling system does not contain the chilled water pipe system, and meanwhile, the low pressure sensor isreplaced with the low pressure switch on the side of the refrigerant.

2.3.2 System Installation Illustration

The installation modes of the air-cooled series unit are shown in Figure 2-8 and Figure 2-9.

Note

1. If the condenser is installed higher than the compressor (see Figure 2-8), a back bend should be fitted to the discharge line andliquid line of the condenser, so as to prevent the liquid refrigerant from flowing back when the condenser stops.

2. The top end of the back bend must be installed higher than the highest copper pipe of the condenser.

Slope discharge

Bac k bend (higher than the highest coppe r pipe of condenser)

Liquid l ine (do not expo se liquid l ine to sunshine)

Trap

Heat insulation f loo r Sealed

Outdoo r unit

Indoor unit

Floor

Condensed wate r ou t

Hum idif ier water in

Raised f loor

M

a x .

7 . 5

m

M

a x . 2

0 m

supply

Condensate drain

Figure 2-8 Condenser installed higher than compressor


19/117



Heat insulation f loo r

Sealed

Outdoo r unit

Floor

Condenser water out

Humidif ier water in

M

i n .

5 m

Slope liquid

Indoor unit

Condensed water out

Raised f loor Slope discharge

supply

Condensate drain

M

a x .

Figure 2-9 Compressor installed higher than condenser

Figure 2-10 shows the arrangement of the cooling water system, which requires the water hotter than 4°C. Use

heaters if the water source in site cannot meet this requirement. The cooling tower should be a closed loop

system.

Closed co ol ing tower

Exhaust water valve

Strainer

Drain valve

Ball

Supplementary valve

Manomete r

Expansion water tank

F ilter P um p

Temperaturegauge

valve

Liebert.PEX-T unitMunitLiebert PEX unit

Figure 2-10 Arrangement of cooling water system

2.3.3 Mechanical Parameters

Indoor unit mechanical parameters

The mechanical parameters of the indoor unit are shown in Figure 2-11, Figure 2-12, Figure 2-13 and Table 2-1.


20/117



8 7 4

8 5 3

1 9 7

0

1 9 7

0

8 7 4

8 5 3

1 7 0 4

1 9 7 0

8 7 4

1 7 0 4

1 9 7 0

8 7 4

2 5 5 3

1 9 7 0

8 7 4

2 5 5 3

8 7 4

1 9 7 0

One-bay upf low

8 5 3

1 9 7 0

8 7 4

One-bay downf low

1 9 7

0

8 5 3

8 7 4

1 7 0 4 1 7 0 4

1 9 7 0

1 9 7 0

8 7 4 8 7

4

Two-bay upf low Two-bay downf low

2 5 5 3 2 5 5 3

1 9 7 0

1 9 7 0

8 7 4 8 7

4

Three-bay up flow Three-bay dow nflow

1 9 7 0

8 7 4

2 5 5 3 2 5 5 3

1 9 7 0

8 7 4

Before instal l ing the f i l ter Three-bay downflow

Figure 2-11 Mechanical parameters of the indoor FC fan unit (unit: mm)


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8 5 3

1 9 7 0

8 7 4

1 9 7 0

8 7 4

1 7 0 4

1 9 7 0

2 5 5 3

8 7 4

8 5 3

1 7 0 4

1 9 7 0

1 9 7 0

8 7 4

8 7 4

1 9 7 0

8 7 4

2 5 5 3

Two-bay upf low Two-bay upf low

Three-bay upf low

Figure 2-12 Mechanical parameters of the indoor EC fan upflow unit (unit: mm)

Note

The indoor unit mechanical parameters of EC fan downflow unit are the same as those of FC fan unit (except for P3100 and

P2070 downflow dual cooling units, see Figure 2-13 for its mechanical parameters).


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1 9 7 0

8 7 4

2 5 5 3

2 0 7 0

8 7 4

2 5 5 3 2 5 5 3

2 5 5 3

2 0 7 0

1 9 7 0

8 7 4

8 7 4

Before install ing the fi lter A fte r in st a lli ng th e fi lter

2 5 5 3

8 7 4

1 9 7 0

2 5 5 3

1 9 7 0

8 7 4

Three-bay downflowB efore installing the filter

Figure 2-13 Mechanical parameters of P3100 downflow dual cooling indoor unit (unit: mm)

Note

For P3100 and P2070 downflow dual cooling series units, the filter is delivered along with the unit accessory, therefore, the unit

integral height can be increased to 100mm after installation. Taking P3100 for example, you can see the left figure of Figure 2-13for dimensions of the filter before the installation and see the right figure of Figure 2-13 for dimensions of the filter after theinstallation.

Table 2-1 Mechanical parameters of indoor unit

ModelDimensions (W × D ×

H) (mm)

Net weight (kg)

Air-cooled series Water-cooled series

Single source

cooling system

Dual cooling

system

Single source

cooling system

Dual cooling

system

P1020 853 × 874 × 1970 320 420 320 420

P1025 853 × 874 × 1970 330 430 330 430

P1030 853 × 874 × 1970 340 440 340 440

P1035 853 × 874 × 1970 350 450 350 450

P2035 1704 × 874 × 1970 550 700 550 700

P2040 1704 × 874 × 1970 590 740 590 740

P2045 1704 × 874 × 1970 560 710 560 710

P2050 1704 × 874 × 1970 610 760 610 760

P2055 1704 × 874 × 1970 570 720 570 720

P2060 1704 × 874 × 1970 640 790 640 790

P2070* 1704 × 874 × 1970 650 800 650 800

P3070 2553 × 874 × 1970 890 1090 890 1090

P3080 2553 × 874 × 1970 910 1110 910 1110

P3090 2553 × 874 × 1970 930 1130 930 1130

P3100* 2553 × 874 × 1970 950 1150 950 1150

Note:

The model with * means that the downflow dual cooling series units will be increased to 100mm after installation

Note

The weight of free cool system unit is the same as that of the dual cooling system unit.


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Plenum dimensions

You can select the air supply plenum with grids for the upflow system according to the requirement. The

appearance of the plenum is shown in Figure 2-14, Figure 2-15 and Figure 2-16. The dimensions are listed in

Table 2-2.

C

B A

C

B A

Figure 2-14 One-bay plenum Figure 2-15 Two-bay plenum

C

B

A

Figure 2-16 Three-bay plenum

Table 2-2 Plenum dimensions

Type A B C

One-bay plenum 867 853 400 (600, optional)

Two-bay plenum 867 1704 400 (600, optional)

Three-bay plenum 867 2553 400 (600, optional)

Note

If the height of the plenum selected for air conditioner unit exceeds 600mm, consult Emerson for non-standard production.

Outdoor unit mechanical parameters

See Liebert PEX Condenser User Manual for the dimensions and mechanical parameters of the outdoor unit.


24/117



Base pallet cutout locations & dimensions

Figure 2-17 and Figure 2-18 show the bases with the side panel removed.

6 0

1 4 9

2 5 5

58

78.8

10 0

C /R

P

1 3 4 2

3 0

108.5

134 .5

126 1133

6 0

1 00 1 30

D

H

1 3 4 2

3 0

108.5

134.5

126 1133

6 0

100 130

6 0

1 4 9

2 5 5

58

78.8

100

One-bay series

Two-bay ser ies

Three-bay series

C I

128 .8

128 .8

8501700

103.5

78.8

1 3 6 . 8

C O

C /R

C I

C /R C O

P

D

H C /R C /R

C IC O

P

D

H

P: Power cable entry hole D: Drain

H: Humidifier water in CI: Chilled water in

CO: Chilled water out C/R: Cooling water in or out/Refrigerant in or out

Figure 2-17 Base cutout location of upflow models (unit: mm)


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F C fa n E C fa n

C /R

H

1 5 1 3

Fan aperture

C I

1 7

0

6 5C /R

CO

93

3 3 2

2

4 0

1 4 0

P

CI

1 7 0

65C /R

CO

9 3

3

3 2

2 4 0

1 4 0P

8 3

3 5 0

2 4 2

1 4 0

CI

D C O

C /R

P 3

3 2

2 4 0

1 4 0

9 3

C /RH

1513

8 3

3 5 0

2 4 2

1 4 0

C I

COC/R

P 3

3 2

2 4 0

1 4 0

9 3

C I

C /R

H 3 5 0

2 4 2

1 4 0 3

3 2

2 4 0

1 4 0

C OC/R

P

93

CI

C /R

H 3 5 0

2 4 2

1 4 0

3 3 2

2 4 0

1 4 0

C OC/R

P

9 3

D

9 4 1 5 13 850.2

Fan aperture

Fa n a pe rture Fa n a pe rture

Fan ape rture Fan aperture Fan aperture

One-bay ser ies

FC fan

EC fan

Two-bay ser ies

FC fan

EC fan

Three-bay ser ies

Fan apertureFan ape rture

Fan ape rtureFan apertureFan aperture

D

H

P: Power cable entry hole D: Drain

H: Humidifier water in CI: Chilled water in

CO: Chilled water out C/R: Cooling water in or out/Refrigerant in or out

Figure 2-18 Base cutout location of downflow (unit: mm)

Fan aperture locations & dimensions of top cover

The top cover fan aperture locations of upflow unit are shown in Figure 2-19.


26/117



FC fan EC fan

FC fan E C fan

FC fan

EC f a n

40 0

80 0

5 0 9

2 5 4

80 0

72 040 3 5

7 2 4 . 8

7 9 4 . 8

210 400 430 400

2 5 4

5 0 9

1650

1650

7 2 4 . 8

7 9 4 . 8

740.5 740.5 3 540

210 400 430 400 498 400

2 5 4

5 0 9

2498

7 9 4 . 8

40

2498

740.5 740.5 72012 889 3

5

7 2 4 . 8

One-bay upflow series

Two-bay upflow series

Three-bay upflow series

89

Figure 2-19 Top cover fan aperture locations of upflow series (unit: mm)


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Side panel cutout locations & dimensions

If piping and wiring from the base are difficult, connection from the side panel can be selected. The locations

and dimensions of the knock-out holes are shown in Figure 2-20. You can select the in and out holes

according to the actual needs, but must confirm that any two of the pipe, power cable and signal cable cannot

use the same hole.

31 9

51 9673.68

41 9

8 7 1

3 7

1 8 7

knock-out hole2- 25

knock-out hole

knock-out hole

8- 80

2- 35

Figure 2-20 Cutout positions of side panel (unit: mm)

2.4 Installing Indoor Unit

2.4.1 Equipment Room Requirement

The requirements of the equipment room are as follows:

1. Damp proof and heat preservation work must be well done to make sure that the environment control

system in the air conditioner room can operate normally.

2. The equipment room should have good heat insulation and sealed damp proof layer. The damp proof layer

of the ceiling and walls must use polyethylene film, and the coating of the concrete wall and the floor must be

damp proof.

3. The outdoor air that enters the equipment room should be reduced to a minimum, better below 5% of thetotal indoor airflow, as it may increase the load of heating, cooling, humidifying and dehumidification of the

system.

4. All the doors and windows should be closed and the openings should be as narrow as possible.

2.4.2 Installation Space

Note

The air conditioner can generate condensate, which may be leakage due to the incorrect installation or use. Do not install it in the

vicinity of any precision equipment so as to maintain the normal operation, and the installation site must provide drain pipes.

1. To ensure normal operation, adequate installation space for the indoor unit must be provided.

2. Avoid locating the indoor unit in confined areas, which can baffle the airflow, shorten the cooling cycle and

result in down-draft and air noise.

3. Avoid locating the indoor unit in a concave or at the end of a long and narrow room.

4. Avoid locating multiple indoor units close to each other. That can result in crossing air patterns,

unbalanced load and competitive operation.

5. For the convenience of daily maintenance, do not install other devices (such as smoke detector) over the

cabinet.


28/117



2.4.3 Requirement Of Maintenance Space

Leave a maintenance space of 850mm in front of the air conditioner unit normally, as shown in Figure 2-21.

8 5 0 m

m

Figure 2-21 Maintenance space

The minimal maintenance space is required as listed in Table 2-3.

Table 2-3 Minimal maintenance space (unit: mm)

Position Air-cooled Water-cooled

Front 600 600

Left 600* 600*

Right 600* 600*

Back 0 0

Note :

1. The space is provided for regular maintenance, such as replacing strainer, adjusting fan, cleaning infared humidifier.

2 *. They are the maintenance space when the water-cooled unit connects water pipes on side or when the air-cooled unit

connects the refrigerant pipes on side. If the water pipes or refrigerant pipes are laid on the bottom of the unit, no

maintenance space is required

Note

For special applications, please consult Emerson.


29/117



2.4.4 Installation Procedures

The installation procedures of the indoor unit are as follows:

1. Make a mounting base according to the dimensions in Figure 2-22, Figure 2-23 and Figure 2-24, and the

requirements in Table 2-4. Emerson can supply a range of mounting bases to suit the required height.

2. Lay a layer of rubber cushion on the top, lateral of the mounting base and on the bottom of the steel plate

respectively. See Figure 2-22, Figure 2-23 and Figure 2-24 for their positions and see Table 2-4 for the

thickness.

3. Determine the installation position. Fix the mounting base onto the mounting position according to the site

conditions and user’s requirement.

4. Fix the air conditioner cabinet onto the mounting base with nuts, spring washers, flat washers and bolts.

6 9 4

8 5 0

Installation hole of 4-M 8 60 sems screw

4 0

H

7 5 8

7 6 4

7 9 8

8 9 3 9 2 6

7 8

1 0 0

Rubber cushion (top)

Base

Instal lation hole of 4-M 8 anchor bo lt

Rubber cushion (bottom )

Rubber cushion (lateral)

A ng le st ee l

Steel plate

Front side of cabinet

Rear s ide of cabinet

Figure 2-22 Mounting base appearance and dimensions of one-bay series (unit: mm)


30/117



1 5 4 4

1 7 0 0

4 0

7 6 4

7 9 8

H

1 7 4 3 1 7 7 6

7 5 8

7 8

1 0 0

Upf low

Installat ion hole o f 4-M 8 60 sems screw



Rubber cushion (bottom)

A ng le st ee l

Base

Installat ion hole o f 4-M 8 anchor bo lt

Rear side of cabinet

Rubber cushion (lateral)

Steel plate

1 5 4 4

1 7 0 0

4 0

7 6 4

7 9 8

H

1 7 4 3 1 7 7 6

7 5 8

7 8

1 0 0

Downf low




Rubber cushion (bottom)

A ng le stee l

Base


Rear side of cabinet

Rubber cushion (lateral)Steel plate

Figure 2-23 Mounting base appearance and dimensions of two-bay series (unit: mm)


31/117



1 5 4 4

1 6 8 0

8 5 0

2 5 5 0

4 0

H

7 5 8

2 5 9 3 2 6 2 6

1 0 0

7 8

7 6 4

7 9 8

Upf low

Installat ion hole of 6-M8 60 sems screw



Rear s ide o f cab inet

Rubber cushion

(lateral)

Steel plate

Rubber cushion

(top)

Rubber cushion

(bot tom)

A ng le st ee l

Base

1 5 4 4

1 6 8 0

8 5 0

2 5 5 0

4 0

H

7 5 8

2 5 9 3 2 6 2 6

1 0 0

7 8

7 6 4

7 9 8

Downf low


Installat ion hole of 4-M8 anchor bo lt


Rear s ide o f cab inet

Rubber cushion

(lateral)

Steel plate

Rubber cushion

(top)

Rubber cushion

(bot tom)

A ng le st ee l

Base

Figure 2-24 Mounting base appearance and dimensions of three-bay series (unit: mm)


32/117



Table 2-4 Specifications of indoor unit mounting base

Item Specification Remark

Steel plate 100mm × 100mm × (5 ~ 6.5)mm -

Angle steel 40mm × 40mm × 3mm -

Rubber

cushion

Top Thickness: 3mm ~ 5mm Supplied by others

Lateral Thickness: 2mm ~ 3mm Supplied by others

Bottom Thickness: 10mm ~ 12mm Supplied by others

Installation hole of

anchor bolt- Install the bolts according to your requirement

H

One-bay H = 200mm (upflow unit)

H 300mm (downflow unit of

forward curved fan)

H 325mm (downflow unit of EC

fan)

1. Only three-bay unit needs the middle support (front and

rear).

2. The upflow unit does not need the flow deflector.

3. The H dimension here is only for reference, and should

be determined according to user’s actual requirement while

making the base

Two-bay

Three-bay

Note:

The external side boards of the unit cannot bear weight. Take the mounting base into consideration while selecting angle

steels and fixing holes. For the downflow unit used EC fan, the minimum floor height requirement must be met

2.5 Installing Outdoor Unit

This outdoor unit is only applicable to the air-cooled series air conditioner. For detailed installation, refer to

Liebert PEX Condenser User Manual .

2.6 Piping

2.6.1 Piping For Air-Cooled Unit

All joints of the cooling pipes must be silver-brazed. Standard industry procedures must be followed in

selecting, laying, and fixing the pipes, and evacuating the system and charging refrigerant. Take pipeline

pressure drop, oil return to the compressor and minimization of noise and vibration into consideration during

design and construction.

General

The recommended pipe sizes are ‘equivalent lengths’ (see Table 2-6 for equivalent lengths of partial

components), with the resistance caused by bends taken into account. The installer should confirm that the

sizes are appropriate for the site conditions.

1. If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and outdoor

unit exceeds the values in Table 2-5, consult Emerson before installation to confirm whether a pipe extension

kit is needed.

Table 2-5 Vertical distance between indoor unit and outdoor unit

Relative position altitude differenceOutdoor unit higher than indoor unit Max.: +20m

Outdoor unit lower than indoor unit Max.: -5m

2. The pipe sizes recommended in Table 2-6 are ‘equivalent lengths’, with the resistance caused by bends and

valves taken into account. The installer should confirm that the sizes are appropriate for the site conditions.

Table 2-6 Equivalent lengths of partial components

Outer Diameter (OD) of

liquid pipe (inch)

Equivalent length (m)

90° bend 45° bend T type three-way

3/8 0.21 0.10 0.76

1/2 0.24 0.12 0.76

5/8 0.27 0.15 0.76

3/4 0.3 0.18 0.76

7/8 0.44 0.24 1.1

1-1/8 0.56 0.3 1.4


33/117



Note

A trap should be installed for every 7.5m of vertical distance. Please consult Emerson for details.

Connecting pipes

The pipes to be connected include:1. Condensate drain pipe of indoor unit

2. Water inlet pipe for infrared humidifier

3. Connection copper pipe (discharge pipe and liquid pipe for air-cooled system) between indoor unit and

outdoor unit

4. Water inlet and outlet pipe of the chilled water (dual cooling unit)

5. Pipe extension kit (optional)

Connecting condensate drain pipe of indoor unit

The condensate of infrared humidifier and evaporator is converged by a cross connector and drained through

the drain pipe, as shown in Figure 2-25. The pipe OD is 25mm. If the drain pipe is used by three or more units,

the minimal pipe OD should be 40mm.

Note

Because the infrared humidifier contains flowing hot water, the water pipe must be resistant to heat higher than 90°C.

ater inlet pipe o f far

infrared humidif ier

Connector of co ndensed

water drain pipe

Connect ion of

condensa te drain pipe

W ater in pipe of

infrared hum idifier

To inf rared hum idi fier water pan

Cross connec to r H o s e c l a m p

To condensed water

pan o f ev apora tor o condensed water

pan of evaporator

To the condensedwater dra in p ipe

To co ndensed

To far infrared humidif ier

To condensatedrain pipe

To condensatepan of evaporator

To condensatepan of evaporator

Figure 2-25 Connection of drain pipe

Note

1. A 25 hose clamp is delivered as an accessory to connect the drain pipe.

2. When connecting the drain pipe, you must make sure that the U bend is installed vertically and the ‘U’ shape is not distorted,

so as to ensure that the condensate can be drained immediately and effectively.

Connecting water inlet pipe of infrared humidifier

Water pipes should be connected for the infrared humidifier. To facilitate maintenance, an isolation valve

should be fitted to the water inlet pipe. The infrared humidifier reserves a copper pipe (OD: 6.35mm), as

shown in Figure 2-26. There is a 1/4” copper nut at the end of the copper pipe. Take out the 1/4” × 1/2”

conversion copper thread connector from the accessory bag and connect it to the copper nut. You can also

choose the connection method to connect pipes according to the site condition. Make sure that the

connection is well sealed to prevent leakage. The main pipe pressure should be between 100kPa ~ 700kPa.


34/117



Where the main pipe pressure may rise above 700kPa, a pressure reducer should be fitted. Where the main

pipe pressure falls below 100kPa, a water tank and pump system should be used.

Note

Some product may include components required by local codes.

Over- temperature

protection switch

W ater out le t

Stainless steel stud

Over- temperatureprotection relay

Ceramic terminal socket

W ater supply p ipe

W ater pan (removable)

W ater supply so lenoid valve

W ater level sensor

Over-temperature protection

W ater level regulator

W ater pan f ix ing screw

W ater supply p ipeOD 6 .35mm A d ire ct io n

A di re ct io n

W ater pan f ixing screw (left and right)

switch (water pan bottom)

OD 6 .35mm

W ater high level sensor

switch (undre pan)

Figure 2-26 Infrared humidifier

Connecting connection copper pipes (discharge pipe and liquid pipe) between indoor unit and outdoor

unit

The indoor unit and outdoor unit are connected through welded copper pipes. The connection ball valves of

the discharge pipe/liquid pipe of indoor unit are shown in Figure 2-27 and Figure 2-28. Note that the ball valve

must be wrapped with a wet cloth before welding. In addition, many notes and instruction labels are pasted

onto the base and side panel close to the ball valve. Protect them from heat burned during the welding

operation.

NoteThe exposure time of system pipes do not exceed 15min. Longer exposure will lead to the POE refrigeration oil being affected

with moisture, which can affect the life of the key components and the stability of the system operation. Especially note that thecompressor and the corresponding expansion valve of the dual refrigerant system unit should be located at both sides of the unit.

For example, you face the unit front door, No.1 system compressor is on the left hand side, while the expansion valve thatcorresponds to No.1 compressor is on the right hand side. Similarly No.2 system compressor is on the right hand side, while theexpansion valve that corresponds to the No.2 compressor is on the left hand side.

Horizontal sections of the discharge pipes should be sloped downward from the compressor, with a slope of

at least 1:200 (5mm down for each 1m run). The discharge pipes should be insulated where they are routed in

the conditioned space (including under a raised floor).

The pressure drop should not exceed 40kPa (5psi ~6psi), provided that there is no loss of refrigeration in the

liquid return pipe. The pressure drop of the liquid return pipe is the sum of liquid flow resistance from thetubing and fitting (including filter drier), plus the loss of head pressure due to elevation above the condenser.

If the liquid temperature is 38°C, the static pressure loss is 11kPa (1.6 psi) per meter of lift.


35/117



System 1 p ipe

A ir- co o led o f up flo w

Sys tem 2expansion valve Sys tem 1

System1 sight

glass

Sys tem 2

System2 sight

glass

S ystem 2 p ipe S ystem 1expansion valve

Sys tem 2expansion valve S y ste m 1 S y ste m 2

Sys tem 1

pipe

System

1 sightglass

System2 sight

glass

System 2 p ipe Sys tem 1expansion valve

Water-cooled of upf low

Figure 2-27 Pipe connection of upflow unit

Sys tem 2expansion valve Sys tem 1 Sys tem 2

System

2 sightglass

System 1 p ipe Sys tem 1

expansion valve

System

1 sightglass

Sys tem 2pipe

System

2 sightglass

System 1 p ipe Sys tem 1expansion valve

System

1 sightglass

Sys tem 2pipe

A ir- co o led o f do wnflo w W at er -c o o led o f do wn flo w

Sys tem 2expansion valve System 1 S ystem 2

Figure 2-28 Pipe connection of downflow unit

Considering the effect of the pipe diameter on the system pressure drop, the pipe diameter of the indoor unit

and outdoor unit should be determined according to the specifications listed in Table 2-7.

Table 2-7 Recommended pipe sizes

Recommended pipe sizes (unit: mm)

Model P1020 P1025 P1030 P1035 P2035 P2040 P2045 P2050

Eq.Lgt

hD L D L D L D L D L D L D L D L

10m 22 13 22 13 22 13 22 13 22 13 22 13 22 13 22 13

20m 22 13 22 13 22 13 22 16 22 16 22 13 22 16 22 13

30m 22 13 22 13 22 16 25 16 25 16 22 13 25 16 22 1340m* 22 13 22 13 22 16 25 16 25 16 22 13 25 16 22 13

50m* 22 13 22 16 25 16 25 16 25 16 22 13 28 19 22 16

60m* 22 16 22 16 25 16 25 19 25 19 22 16 28 19 22 16

Model P2055 P2060 P2070 P3070 P3080 P3090 P3100

Eq.Lgt

hD L D L D L D L D L D L D L

10m 22 16 22 13 22 13 22 13 22 13 22 13 22 16

20m 25 16 22 13 22 16 22 16 22 16 25 16 25 16

30m 28 19 22 16 25 16 25 16 25 16 25 16 28 19

40m* 28 19 22 16 25 16 25 16 25 16 25 16 28 19

50m* 28 19 25 16 25 16 25 16 28 19 28 19 28 19

60m* 32 19 25 16 25 19 25 19 28 19 28 19 32 19Note

1. A pipe extension kit is required for ‘Eq.Lgth’ marked with *.


36/117



Recommended pipe sizes (unit: mm)

2. D: discharge line, L: liquid line.

3. Consult Emerson if the pipe length exceeds 60m

Connecting water inlet and outlet pipe of the chilled water (dual cooling unit)

The water inlet and outlet pipe of the chilled water is connected to the chilled water unit through welding. The

inlet and outlet pipe of the chilled water should be welded according to the unit rack labelling, do not reversethe connection. The water inlet and outlet pipe of the chilled water can be connected from the base pallet or

side panel, see the cutout positions schematic diagram of the base pallet and side panel for pipe entry

position (see Figure 2-17, Figure 2-18, Figure 2-20). There should be a flexible connector for water inlet and

outlet pipe and unit connection. The water inlet pipe must be installed with a strainer more than 60 mesh. The

water inlet and outlet pipe of the chilled water should be installed more than one isolation valve, so as to cut

off the power upon repair. One of the isolation valves can be a balancing valve. The chilled water system with

a balancing valve has higher efficiency, and can control the water distribution more accurately.

Installing pipe extension kit (for site installation)

When the equivalent length of the one-way pipe exceeds 30m, the pipe extension kit should be installed.

During the installation of the pipe extension kit, to avoid the pipe opening, it is recommended to install the

solenoid valve of the pipe extension kit onto the outside project pipe of the ball valve on the liquid pipe. The

outer side or the bottom of the unit is allowable.

So, during installing the solenoid valve, you do not need to cut the indoor unit pipes. After the whole system

is installed, you can open the ball valve to keep pressure and carry out the vacuum operation, avoiding the

moisture absorption of the compressor refrigeration oil and ensuring the operation safety and life of the

compressor. For the installation position of the check valve, refer to Figure 2-6.

For the electrical connections of the pipe extension kit, refer to 3.2.4 Connecting Solenoid Valve Of Pipe

Extension Kit (Options, For Site Installation).

Charging refrigerant and adding refrigerant oil

1. Charging refrigerant

The Liebert PEX air-cooled series air conditioner has been charged in the factory with 2bar nitrogen.

If the connection pipe between the indoor unit and the outdoor unit is longer than 10m, refill the refrigerant to

the system to ensure normal system operation.

The refilling amount of the refrigerant is calculated through the following formula:

Refrigerant refilling amount (kg) = refrigerant refilling amount per unit length of liquid pipe (kg/m) × total

length of extended liquid pipe (m)

See Table 2-8 for refrigerant refilling amount of per meter liquid pipe.

Total length of extended liquid pipe (m) = Total length of liquid pipe (m) - 10m

Table 2-8 Refrigerant refilling amount per unit length of liquid pipe with different ODs

Liquid pipe OD

(mm)

Refrigerant refilling amount of per

meter liquid pipe (kg/m)

Liquid pipe OD

(mm)

Refrigerant refilling amount of per

meter liquid pipe (kg/m)

9.52 0.060 19 0.261

12.7 0.112 22 0.362

16 0.181 28.6 0.618

For the refrigerant charge quantity, refer to step 5 in 4.2.2 Commissioning Procedures.

2. Adding POE refrigerant oil

The refilled refrigerant will dilute the POE refrigerant oil in the system and affect the lubricating and cooling

effects of the POE refrigerant oil. Therefore, the POE refrigerant oil should be added. See the formula below:

Amount of refrigerant oil (ml) to be added = refrigerant refilling amount (kg) × 22.6

2.6.2 Piping For Water-Cooled Unit

Each cooling system uses a BPHE (or condenser) and an electric valve. The water supply (inlet) pipe and

water return (outlet) pipe of the cooling water should be connected for the system. See Figure 2-29.

A filter (filter mesh: 1mm) and multiple isolation valves should be mounted one side of the water supply pipe

of the cooling water. One of the valves can be a balancing valve.


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The cooling water system with a balancing valve can control the water distribution more accurately and its

pump has higher efficiency. On the other hand, the electric valve can keep the optimal condensing

temperature by regulating the internal water flow.

The electric actuator of the regulating valve features a manual override to allow water side balancing by the

installer.

It is recommended to arrange the cooling water pipes separately for different systems, so that repairing one

pipe will not affect the operation of the other one.

The water pressure should be high enough to counteract the pressure drops brought about by all the

components of the water system. In addition, because the sediments and impurities cause more pressure

drop after long term operation, you should arrange a redundancy of 20% ~ 25% when selecting the lifting part

(such as pump).

See Figure 2-6 and Figure 2-7 for the system arrangement of the water-cooled unit.

Connecting pipes

The pipes to be connected include:

1. Condensate drain pipe of indoor unit

2. Water inlet pipe of infrared humidifier

3. Water inlet and outlet pipe of cooling water 4. Water inlet and outlet pipe of chilled water (dual cooling unit)

Connecting condensate drain pipe of indoor unit

Refer to the corresponding content in 2.6.1 Piping For Air-Cooled Unit .

Connecting water inlet pipe of infrared humidifier


Connecting water inlet and outlet pipe of cooling water

The water inlet and outlet pipe of cooling water of the indoor unit are copper pipes with 35mm outer diameter,

as shown in Figure 2-29. Connect the pipes through direct welding at the site and make sure that the junction

is well-sealed.

W ater outlet

W ater inlet

B P H E

Figure 2-29 Unit connections (water-cooled)

Connecting water inlet and outlet pipe of chilled water (dual cooling unit)


2.7 Lowering Fan And Removing Fixtures (Downflow EC Fan System)

2.7.1 Downflow Unit EC Fan Lowering

After installation, you must lower all fans of the EC downflow unit before commissioning. You lower the fan

using the supplied hand winch. Each EC downflow unit is only equipped with one lowering tool, so you

should select the lowering mode according to the equipped lowering tool.


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Note

Be careful when lowering the fan, avoid trapping your fingers and fan cables, and avoid foreign matter falling into the inlet ring

of the fan.

Lowering Fan Through Hand Winch Mode

The downflow unit has been equipped with a set of fan elevator assembly before delivery, including a handwinch, a winch bracket, a hook, a sling, a winch limit and a handle in Figure 2-30, and also an L shaped lifting

component in Figure 2-31.

H o o k

Handle

W inch bracket

Sling Winch

Figure 2-30 Fan elevator assembly (winch mode)

Lower the fan with the fan elevator assembly installed according to the following procedures:

1. Open the unit maintenance cover, check the fixing bolts and washers II (see Figure 2-31, totally 2 pcs) of the

L shaped lifting component to make sure that it is fixed properly, and then install the fixing bolts and washers

IV (totally 4 pcs) of the winch bracket, as shown in Figure 2-31.

Unit beam

Unit beam

Winch bracket

L shaped lif t ing component

M iddle round hole

Fan

Gaskets II

Winch

Handle

Gaskets IV

Sling

W ashers IV

W ashers II

Figure 2-31 Installing winch bracket

2. Turn the handle and use the hook of the winch to hook the middle round hole (see Figure 2-31) of the L

shaped lifting component. Adjust the handle until the sling is completely tight.

3. Cut off the cable tie binding the fan cables to make the cables length satisfy fan lowering requirements, and

then remove the fixing bolts and washers I (see Figure 2-32, totally 4 pcs) for fan transportation.

8/18/2019 Liebert PEX - Compressor Models User Manual - A

Liebert PEX - Compressor Models User Manual - AP11ENT-PEXCompModelsV1-UM

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